Missed Femara 3-7...will 4-8 be ok?

I am supposed to take Femara on CD (cycle day) 3-7, but I didn't make it to the pharmacy in time..and I can't call my Dr's office because they're closed on weekends. I'm not seeing on RE (reproductive endocrinologist) yet, the Femara was prescribed by my OB/GYN. Since I wasn't able to start the Femara on CD3 should it be ok to start it on CD4? Should I make up for the missed dose yesterday and take it 4-7 or just move the days to 4-8? I hate not being able to call and ask my dr, and I would really hate to skip a month if she would end up telling me to just take it 4-8.

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